The radiative lifetime of charged excitons in a single self-assembled quantum dot

Paul A. Dalgarno, Patrick Gillies, Jamie McFarlane, Brian D. Gerardot, Khaled Karrai, Pierre M. Petroff, Ian Galbraith, Richard J. Warburton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The small physical size of self assembled quantum dots gives rise to pronounced Coulomb interactions within the dots. By studying different excitons in the same quantum dot we show that the Coulomb interactions significantly alter the radiative recombination lifetime. The lifetime changes are larger upon charging from the neutral exciton to the positively charged exciton than from charging from the neutral exciton to the negatively charged exciton. This is attributed to a frozen electron wavefunction and a non-frozen hole wavefunction, leading to a non-perturbative hole-hole Coulomb interaction. Theoretical calculations based on a path integral quantum Monte-Carlo approach show good agreement between experiment and theory. © 2007 American Institute of Physics.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
EditorsW Jantsch, F Schaffler
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Pages1091-1092
Number of pages2
Volume893
ISBN (Print)978-0-7354-0397-0
DOIs
Publication statusPublished - 2007
Event28th International Conference on the Physics of Semiconductors - Vienna
Duration: 24 Jul 200628 Jul 2006

Conference

Conference28th International Conference on the Physics of Semiconductors
Abbreviated titleICPS-28
CityVienna
Period24/07/0628/07/06

Keywords

  • Coulomb interactions
  • Lifetime
  • Path integral Monte-Carlo
  • Quantum dot

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